Multigene Phylogeny of Selected Anamorphic Ascomycetes
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Home > History and Archaeology > History > Multigene Phylogeny of Selected Anamorphic Ascomycetes
Multigene Phylogeny of Selected Anamorphic Ascomycetes

Multigene Phylogeny of Selected Anamorphic Ascomycetes


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This dissertation, "Multigene Phylogeny of Selected Anamorphic Ascomycetes" by Belle Damodara, Shenoy, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled MULTIGENE PHYLOGENY OF SELECTED ANAMORPHIC ASCOMYCETES submitted by Belle Damodara Shenoy for the degree of Doctor of Philosophy at The University of Hong Kong in September 2007 This thesis investigates the taxonomic utilities of DNA sequence data in selected groups of anamorphic ascomycetes. The historical practice and limitations of the dual classification system are reviewed in light of recent molecular phylogenetic studies. The morphocentric classification scheme for Sporidesmium and morphologically similar fungi was tested using a multi-gene phylogenetic approach. The sporidesmium-like taxa are not monophyletic and are found to be phylogenetically associated with members of the Dothideomycetes and Sordariomycetes. Morpho-taxonomic characters, such as conidial septation, presence or absence of distinct conidiophores, and the type of conidiophore proliferation have undergone convergent evolution. These anamorphic characters are, therefore, not significant in the phylogeny-based classification of sporidesmium-like taxa. The taxonomy of Diplococcium and Spadicoides was also revisited based on phylogenetic analyses of partial ribosomal DNA and RNA polymerase II second largest subunit (RPB2) gene sequence data. Phylogenies indicate that both Diplococcium and Spadicoides are polyphyletic and conidial catenation is not a reliable phylotaxonomic character. The diplococcium-like taxa are related to the Dothideomycetes and Leotiomycetes. Members of Spadicoides are distributed in Pleosporaceae (Dothideomycetes) and Sordariomycetidae (Sordariomycetes). Two spadicoides-like genera, Paliphora and Polyschema are related to Chaetosphaeriales (Sordariomycetes) and Pleosporales (Dothideomycetes), respectively. Colletotrichum capsici is characterised and epitypified based on morpho- molecular characters. The type specimen of Colletotrichum capsici is in relatively good condition, but could not provide viable cultures necessary to obtain DNA sequence data. Fresh specimens of this species were, therefore, collected from chilli fruit (Capsicum frutescens) in the proximity of the original location as stated in the protologue. An epitype for the name Colletotrichum capsici is designated using living cultures in order to stabilise the application of the species name. Multi-gene phylogenies suggest a close phylogenetic relationship of the epitype with strains of Colletotrichum capsici from Thailand. Future studies, however, are needed to test this hypothesis as species-delineation in Colletotrichum is still unresolved. Investigating the phylogenetic history of some anamorphic taxa has provided insights into the current morphocentric classification schemes. This thesis supports the view that many of the anamorphic taxa are derived from polyphyletic lineages. Molecular and other biological data need to be incorporated to refine the morphology-based classification systems of anamorphic taxa. Examination of senescent culms of monocotyledons in Hong Kong and India has revealed four interesting taxa. Oxydothis bambusicola sp. nov. and Pseudohalonectria miscanthicola sp. nov. - teleomorphic fungi with unknown anamorphs - are described from graminaceous hosts in Hong Kong. Massariothea themedae, a graminicolous anamorphic taxon collected from Kudremukh National Park in India, is re-described and shown to


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Product Details
  • ISBN-13: 9781374676268
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • Weight: 508 gr
  • ISBN-10: 1374676268
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Spine Width: 11 mm
  • Width: 216 mm

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